Interstate 25 in Wyoming

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Interstate 25 marker

Interstate 25
Dwight D. Eisenhower Highway
(from I-70 in Denver to I-80 in Cheyenne)
Route information
Maintained by WYDOT
Length: 300.53 mi[1] (483.66 km)
Major junctions
South end: I-25 / US 87 at the Colorado state line near Cheyenne
North end: I-90 / US 87 near Buffalo
Counties: Laramie, Platte, Converse, Natrona, Johnson
Highway system
WYO 24 US 26

Interstate 25 (I-25) is a part of the Interstate Highway System that runs from Las Cruces, New Mexico, to Buffalo, Wyoming. In Wyoming, the Interstate Highway runs 300.530 miles (483.656 km) from the Colorado state line near Cheyenne north to its national terminus at I-90 near Buffalo. I-25 connects Wyoming's largest city and capital, Cheyenne, with its second largest city, Casper, and the smaller communities of Wheatland, Douglas, and Buffalo. The highway also connects those cities with Denver and Billings via I-90. I-25 runs concurrently with U.S. Route 87 (US 87) for almost its entire course in Wyoming. The highway also has extensive concurrencies with US 20 and US 26 along its east–west segment through the North Platte River valley. The Interstate has business loops through Cheyenne, Chugwater, Wheatland, Douglas, Glenrock, Casper, and Buffalo.

Route description[edit]

Cheyenne to Wheatland[edit]

I-25 enters Laramie County concurrent with US 87 from Weld County, Colorado, southwest of Cheyenne and briefly runs parallel to a BNSF Railway line. The four-lane Interstate has its first interchange, a diamond interchange with Wyoming Highway 223 (WYO 223) (Terry Ranch Road), and crosses over the Union Pacific Railroad's Speer Subdivision rail line and over the BNSF rail line. I-25 meets High Plains Road at a dumbbell interchange, then has a diverging diamond interchange with WYO 212 (College Drive), a junction that serves as the southern end of Interstate 25 Business (I-25 Bus.). The freeway has a cloverleaf interchange with I-80, crosses over the Union Pacific's Laramie Subdivision and US 30 (Lincolnway), and has a four-ramp partial cloverleaf interchange with US 30, which here is also part of I-80 Bus..[1]

I-25 continues north along the western edge of the city of Cheyenne and along the eastern edge of Francis E. Warren Air Force Base, which is served by the next three interchanges. The highway has a five-ramp partial cloverleaf interchange with Missile Drive, crosses over a BNSF rail yard, and has a diamond interchange with Randall Road, which leads to Pershing Boulevard. I-25 reconnects with its business route at Central Avenue, where US 85 joins the Interstate. The freeway has a dumbbell interchange with Vandehei Street before leaving the city of Cheyenne and passing through the unincorporated area of Ranchettes. I-25 has an interchange with WYO 211 (Horse Creek Road) before US 85 splits to the northeast. There is no direct access from southbound I-25 to northbound US 85 at the latter interchange; southbound traffic uses the WYO 211 interchange to turn around to access northbound US 85.[1]

I-25 continues through sparsely populated northern Laramie County, where the Interstate crosses Lodgepole Creek and has five interchanges with minor roads: Ridley Road, an unnamed road only marked as Exit 25, Whitaker Road, Nimmo Road, and an unnamed road that serves the Little Bear Community. The Interstate enters Platte County at its interchange with Bear Creek Road. I-25's first population center north of Cheyenne is Chugwater, where the highway crosses over a BNSF rail line and Chugwater Creek, has an interchange with WYO 211 and WYO 313 in town, and has an interchange with WYO 321 (Ty Basin Road) north of town. Those two interchanges serve as the termini for Chugwater's I-25 Bus.. The Interstate meets the western end of WYO 314 (Slater Road) west of Slater; has minor interchanges with Hunton Road, Antelope Road, and Bordeaux Road; and meets the eastern end of WYO 34.[1]

Wheatland to Casper[edit]

I-25 bridge over the North Platte River at Douglas

I-25's next serves the town of Wheatland, the county seat of Platte County. Wheatland's I-25 Bus. splits off onto Mariposa Boulevard and provides access to WYO 310 and WYO 312. The Interstate and business route reconvene at the north end of town. I-25 has minor interchanges with Laramie River Road near its crossing of the Laramie River and with Johnson Road. The Interstate meets US 26 at a directional T interchange at Dwyer Junction, and the U.S. Highway joins I-25 and US 87 heading north. I-25 has minor interchanges with El Rancho Road and an unnamed access road to Middle Bear around a junction with the southern end of WYO 319 (Cassa Road). The Interstate has an interchange with WYO 319 Spur in the town of Glendo, then parallels WYO 319 and the BNSF rail line northwest into Converse County to the west of the Glendo Reservoir, an impoundment of the North Platte River. I-25 crosses over the North Platte River and a BNSF rail line at Orin, where the Interstate has an interchange with and is joined by US 20; this interchange serves as the western terminus of US 18.[1]

I-25, US 87, US 20, and US 26 head west to Douglas, the county seat of Converse County. I-25 Bus. and its companion business routes—US 87 Bus., US 20 Bus., and US 26 Bus.—split northwest from a trumpet interchange into the city while I-25 and the mainline U.S. Highways pass to the south of the city. I-25 crosses over the BNSF rail line and the North Platte River, then curves northwest to meet the business routes at a trumpet interchange on the west side of the city near the business routes' intersection with WYO 59, which leads north to Gillette. I-25 continues west through interchanges with the western end of WYO 96 (La Prele Road), Inez Road, the road south to Ayres Natural Bridge, Barber Road, and Bixby Road. US 87, US 20, and US 26 diverge from I-25 east of Glenrock. I-25 Bus. joins the U.S. Highways in heading northwest toward the town, then reconnects with I-25 via WYO 95 (Deer Creek Road) south of town. I-25 enters Natrona County and has interchanges with WYO 253 (Hat Six Road) and WYO 258 (Wyoming Boulevard), which serves the town of Evansville to the north.[1]

Casper to Buffalo[edit]

I-25 briefly parallels US 87, US 20, and US 26 (Yellowstone Highway) and enters the city of Casper at a complex junction—the complexity is explained in the description for I-25 Bus.—where the Interstate crosses over Yellowstone Highway, the three U.S. Highways join I-25, I-25 Bus. splits from the Interstate to serve downtown Casper, and US 87 Bus., US 20 Bus., and US 26 Bus. split from the mainline U.S. Highways on Yellowstone Avenue. I-25, US 87, US 20, and US 26 cross over the BNSF rail line and are paralleled by a pair of frontage roads, F Street to the north and E Street to the south. There are several slip ramps between I-25 and the frontage roads serving the three streets that connect the portion of Casper north of the BNSF rail line to downtown Casper. The first street, which is Bryan Stock Trail north of the Interstate and Beverly Street to the south, is part of the complex junction between the mainline Interstate and U.S. Highways and their business routes. The second street is McKinley Street, and the third street, Center Street, which carries the northmost portion of I-25 Bus. and US 87 Bus. E Street begins from an exit ramp to Center Street as I-25 and F Street cross the North Platte River. West of the river, the freeway has a diamond interchange with WYO 220 (Poplar Street), then curves north and has a diamond interchange with US 20 and US 26, which split west toward Shoshoni and Casper–Natrona County International Airport, and the access road to the Casper Events Center.[1]

I-25 leaves the city of Casper and has an interchange with WYO 254 (Wardwell Road) next to unincorporated Hartrandt and the town of Bar Nunn. The Interstate has an interchange with Ormsby Road in the Homa Hills area on the northern edge of the Casper populated area. I-25 has minor interchanges with Ranch Road and an unnamed road marketed as Exit 223, then connects with the south end of WYO 387, which serves Midwest to the east, before entering Johnson County. The freeway has interchanges with Tisdale Mountain Road and Powder River Road just north of the highway's crossing of the South Fork of the Powder River. I-25 meets the southern end of WYO 196 (TTT Road) and parallels the state highway to Kaycee, where the highway crosses the Middle Fork of the Powder River and has an interchange with WYO 191. North of Kaycee, I-25 crosses the North Fork of the Powder River and has minor interchanges with Reno Road, Middle Fork Road, and Trabing Road and a crossings of two branches of Crazy Woman Creek near the Middle Fork interchange. The final I-25 Bus. and its companion, US 87 Bus., split off to the south of the town of Buffalo, the county seat of Johnson County. East of the town, I-25 has an interchange with US 16, which also carries I-90 Bus.. The Interstate reaches its northern terminus at a directional T interchange with I-90. US 87 continues north along westbound I-90 toward Sheridan and Billings; I-90 also heads east toward Gillette. Buffalo's I-25 Bus. and US 87 Bus. have their northern termini at a partial interchange just west of the I-25–I-90 junction.[1]

Exit list[edit]

County Location mi[1] km Exit Destinations Notes
Laramie 0.000 0.000 I-25 / US 87 south – Denver Colorado state line
2.662 4.284 2 WYO 223 east (Terry Ranch Road)
4 High Plains Road Dumbbell interchange
Cheyenne 7.857 12.645 7 I-25 Bus. / WYO 212 north (College Drive) Diverging diamond interchange
8.844 14.233 8 I-80 to US 85 – Sidney, Laramie Split into exits 8B (west) and 8D (east); I-80 exits 359A-C
9.140 14.709 9 I-80 Bus. / US 30 (Lincolnway) – Central Business District
10.586 17.037 10D Missile Drive – Warren Gate 2 Split into exits 10B (Warren Gate 2) and 10D (Missile Drive) southbound
11.239 18.087 11 Randall Avenue, Pershing Boulevard – Warren Gate 1
12.697 20.434 12 I-25 Bus. / US 85 south (Central Avenue) South end of concurrency with US 85
13.834 22.264 13 Vandehei Avenue Dumbbell interchange
Ranchettes 16.230 26.120 16 WYO 211 (Horse Creek Road) Use southbound exit to U-turn for US 85 north
17.236 27.739 17 US 85 north – Torrington No southbound exit; north end of concurrency with US 85
21.318 34.308 21 Ridley Road
25.452 40.961 25 Exit 25
29.512 47.495 29 Whitaker Road
34.440 55.426 34 Nimmo Road
39.235 63.143 39 Little Bear Community
Platte 47.248 76.038 47 Bear Creek Road
Chugwater 54.590 87.854 54 I-25 Bus. north / WYO 211 south / WYO 313 east – Chugwater
57.649 92.777 57 I-25 Bus. (Ty Basin Road) / WYO 321 south – Chugwater
65.253 105.015 65 WYO 314 east (Slater Road)
66.200 106.539 66 Hunton Road
68.454 110.166 68 Antelope Road
70.621 113.653 70 Bordeaux Road
73.025 117.522 73 WYO 34 west – Laramie
Wheatland 78.600 126.494 78
I-25 Bus. / US 87 Bus. north – Wheatland
80.853 130.120 80
I-25 Bus. / US 87 Bus. south – Wheatland
84.744 136.382 84 Laramie River Road
87.505 140.826 87 Johnson Road
Dwyer Junction 92.371 148.657 92 US 26 east – Guernsey, Torrington Directional T interchange; south end of concurrency with US 26
94.825 152.606 94 El Rancho Road
100.125 161.136 100 WYO 319 north (Cassa Road)
104.043 167.441 104 Middle Bear
Glendo 111.675 179.723 111 WYO 319 Spur – Glendo
Converse Orin 126.467 203.529 126 US 18 / US 20 east – Lusk South end of concurrency with US 20; western terminus of US 18
Douglas 135.472 218.021 135 I-25 Bus. north – Douglas
140.101 225.471 140 I-25 Bus. south to WYO 59 – Douglas, Gillette
146.003 234.969 146 WYO 96 east (La Prele Road)
150.442 242.113 150 Inez Road
151.166 243.278 151 Ayres Natural Bridge
154.237 248.220 154 Barber Road
156.178 251.344 156 Bixby Road
160.871 258.897 160 I-25 Bus. / US 87 north / US 20 / US 26 west – East Glenrock West end of concurrencies with US 20, US 26, and US 87
Glenrock 165.909 267.005 165 I-25 Bus. south / WYO 95 north (Deer Creek Road) – Glenrock, Rolling Hills
Natrona Casper 182.530 293.754 182 WYO 253 (Hat Six Road)
185.354 298.298 185 WYO 258 (Wyoming Boulevard) – Evansville
186 I-25 Bus. north / US 87 south / US 20 / US 26 east / North Beverly Street, Bryan Stock Trail South end of concurrencies with US 87, US 20, and US 26; southern terminus of I-25 Bus. and US 87 Bus.
187.527 301.795 187 McKinley Street
I-25 Bus. (Center Street) / US 87 Bus. south
No northbound entrance; northern terminus of I-25 Bus. and US 87 Bus.
188.600 303.522 188B WYO 220 west (Poplar Street)
189.507 304.982 189 US 20 / US 26 west – Shoshoni, Airport North end of concurrency with US 20 and US 26
Hartrandt 191.644 308.421 191 WYO 254 south (Wardwell Road)
Homa Hills 197.522 317.881 197 Ormsby Road
210.412 338.625 210 WYO 259 north (Horse Creek Ranch Road)
216.605 348.592 216 Ranch Road
223.780 360.139 223 Exit 223
227.987 366.910 227 WYO 387 north – Midwest, Edgerton
Johnson 235.375 378.799 235 Tisdale Mountain Road
246.560 396.800 246 Powder River Road
249.688 401.834 249 WYO 196 north (TTT Road)
Kaycee 254.254 409.182 254 WYO 191 – Kaycee
265.476 427.242 265 Reno Road
280.177 450.901 280 Middle Fork Road
291.077 468.443 291 Trabing Road
Buffalo 298.024 479.623 298
I-25 Bus. / US 87 Bus. north
299.321 481.710 299 I-90 Bus. / US 16 – Buffalo
300.530 483.656 300 I-90 east – Gillette Northbound exit and southbound entrance; I-90 exit 56B
I-90 west / US 87 north – Sheridan Northern terminus of I-25; north end of concurrency with US 87; I-90 exit 56B; tri-level directional T interchange.
1.000 mi = 1.609 km; 1.000 km = 0.621 mi

Business routes[edit]

I-25 has seven Interstate business loops in Wyoming.


  1. ^ a b c d e f g h i "Vehicle Miles Book" (PDF). Wyoming Department of Transportation. 2013. Retrieved 2013-03-06. 

External links[edit]

KML is from Wikidata

Interstate 25
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